Full time-part time sitter for 4

I have 4 little people 3 girls one boy. My son is 2 months and my daughters are 12, 8 & 5. My oldest daughter is very independent and very helpful when it comes to her siblings. They are very sweet and loving kids. My middle and youngest do have a lot of energy at times but they are very respectful and obedient. This job consists of caring for the 2 month old full time until he is in daycare. The other 3 will be in school so the sitter will need to pick them up the two younger kids go to the same school next door to the middle school. After school care for 4 hours until I get home from work at 7:15. Saturdays a full day with all 4. The oldest is not really a child that needs much babysitting she’s actually your assistant if need be. So the focus is the main 3 as my 12yo has a busy day with school & friends and sometimes she visits her aunt. Shes very independent. The baby will be in daycare soon so after that the schedule is from 2p-7pm and sat 11a-7p